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Postretirement Benefits (Tables) | 6 Months Ended
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Jun. 30, 2018
Defined Benefit Plan [Abstract] |
Schedule of Net Pension and Other Benefit Costs | Pension and other postretirement benefit costs included the following components for the three months and six months ended June 30, 2018 and July 1, 2017:
| Pension Benefits |  | Other Postretirement Benefits
| Three Months Ended |  | Six Months Ended |  | Three Months Ended |  | Six Months Ended
(in millions) | Jun 30, 2018 |  | Jul 1, 2017 |  | Jun 30, 2018 |  | Jul 1, 2017 |  | Jun 30, 2018 |  | Jul 1, 2017 |  | Jun 30, 2018 |  | Jul 1, 2017
Interest cost | $ | 5.7 |  |  | $ | 7.1 |  |  | $ | 11.4 |  |  | $ | 14.2 |  |  | $ | 0.2 |  |  | $ | 0.4 |  |  | $ | 0.5 |  |  | $ | 0.7 |
Expected return on plan assets | (6.4 | ) |  | (8.3 | ) |  | (12.7 | ) |  | (16.7 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service credits | — |  |  | — |  |  | — |  |  | — |  |  | (0.1 | ) |  | (0.2 | ) |  | (0.3 | ) |  | (0.4 | )
Amortization of net actuarial losses | 2.6 |  |  | 3.6 |  |  | 5.1 |  |  | 7.2 |  |  | — |  |  | — |  |  | — |  |  | — |
Net pension and other benefit costs | $ | 1.9 |  |  | $ | 2.4 |  |  | $ | 3.8 |  |  | $ | 4.7 |  |  | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.3 |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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